James Arness (How the West Was Won) is back in the saddle as U.S. Marshal Matt Dillon for one last time - the character Arness immortalized in Gunsmoke (1955-1975), the most popular western show in television history and the longest running primetime dramatic TV series of all time. In Gunsmoke: One Man's Justice, desperadoes are on the loose and gun barrels are ablaze as Matt Dillon saddles up to save an innocent teenage boy out to avenge his mother's brutal stagecoach murder by a ruthless gang of outlaws. Aiding Dillon is one of the stagecoach's passengers, the mysterious Davis Healy (Bruce Boxleitner, Scarecrow and Mrs. King), a traveling salesman of considerable charm, wit and great skill as a marksman.